android ListView中的Item有Button时候点击异常处理

1.当ListView中有Button的时候往往会遇到很多问题，比较常见的一个问题是：

　　假设：在ListView中有N个Item当点击其中某个Item中的Button的时候，需要改变当前Button的状态，在你点击以后确实最后一个Item的Button的状态改变了，不管点击哪一个Button都是最后一个

　Item的中的Button的状态被改变了，这里涉及到ListView重绘的问题。

　　要解决上面的问题的方法是将点击的监听事件提出来进行封装，在用就可以解决上述问题了。

给个示例代码：

在ListView的自定义Adapter的getView方法中：

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" 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MianActivity自定义Adapter中

 @Override
         public View getView(int position, View convertView, ViewGroup parent) {

             System.out.println("getViewgetViewgetViewgetViewgetView");
             if (convertView == null) {
                 viewHolder = new ViewHolder();
                 convertView = LayoutInflater.from(context).inflate(
                         R.layout.item, null);
                 viewHolder.left = (Button) convertView
                         .findViewById(R.id.btn_left);
                 viewHolder.right = (Button) convertView
                         .findViewById(R.id.btn_right);
                 mOnClickListener = MyOnClickListener.instance();
                 mOnClickListener.setContext(MainActivity.this);
                 viewHolder.left.setOnClickListener(mOnClickListener);
                 convertView.setTag(viewHolder);
             } else {
                 viewHolder = (ViewHolder) convertView.getTag();
             }

             return convertView;
         }

viewHolder.left这个Button的点击事件封装一下就可以消除上述问题了

MyOnClickListenter：

 public class MyOnClickListener implements OnClickListener {

     private static MyOnClickListener mOnClickListener;

     private Button btn;

     private Context context;

     public static MyOnClickListener instance() {
         if (mOnClickListener == null) {
             mOnClickListener = new MyOnClickListener();
         }

         return mOnClickListener;
     }

     public void setContext(Context context) {
         this.context = context;

     }

     @Override
     public void onClick(View v) {
         btn = (Button) v;
         final EditText edtextView = new EditText(context);
         new AlertDialog.Builder(context).setTitle("请输入密码").setView(edtextView)
                 .setPositiveButton("确定", new AlertDialog.OnClickListener() {

                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         System.out
                                 .println("setPositiveButtonsetPositiveButtonsetPositiveButton");
                         String passwaord = edtextView.getText().toString()
                                 .trim();
                         System.out.println("获取到的密码是多少-->>" + passwaord);
                         if (passwaord.equals("123")) {
                             System.out
                                     .println("执行了123132123132123132132131313");
                             btn.setText("关闭中");
                             btn.setBackgroundResource(R.drawable.toggle_bg_on);
                         }

                     }
                 }).create().show();

     }

 }

示例代码下载